Electric accumulator.



C. DE SEDNEFF. ELECTRIC ACCUMULATOR. AFPLIVCATION man JULY 28,1913.

MU Him ll 1] Illllllll\ Patented Jan. 23, 1917.

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To all whom it may concern Be it known that I, Comer-anus on Sm mars, a sub'ect of the Em eror of Russia; re siding at aris, France, ave invented certain new and useful Improvements in Elec tric Accumulators, of which the following is a full, clear, and exact specification.

My invention relates to e1ectr1caccumulators and. has as its principal object the pro- .vision of electrodes having a very large ac-' tive surface per unit weight combined with high rigidity and permeability toward the electrolyte.

A second object .of my invention is to p'r0- vide an electrode in which the difference of potential between the parts of the active mass which are in contact shall be as small tiorial View on the'line t u of Fig. 1 and.

as 'ossible;

i final object of my invention resides the particular arrangement an of parts hereinafter described.

- 1n the accompanying drawings: Figure 1 is an elevational view of; an electrode constructedaccording to my invention, partsv being broken away. Fig. 2 is across-secshowing one series 'of cells as superim posed upon'series just below it. Fi -3 is a cross-section onthe line 8-r of. ig.:1.

Fig. 4 is a crosssection on the line :v,-y of ,FiEBI, Fig.5 is a top plan .view of Fig. 1-.

ferring more particularly to the drawing, 1 is-theouter shell of the electrode,'the opposite faces of which are connected by means of'horizo'ntal layers of'webs,"which maybe ofany'desired cross-section. A. web

'having one' form of cross-section is shown at A. -The spaces G intermediate the metal webs arefilled by active material and-this material may be introduced as paste or formed, in lace by electrolytic action. It willfbe un erstood that the webs in adjacent layers are, shown crossing each other at right angles, although the articularan- Is is notessential. The we s in a given orizontal plane-or layer are spaced apart to forincells or apertures for containing the. active material as indicated at G. A iven horizontal layer of webs or bars wit its interposed quantities of active material is superposed above" another: -hori'zontal .hiyer similar to the first only having the webs; or bars at an angleto thosei'n the first'in 'the manner-in which cord wood mightbe piled up-into angles one above the-joth'en Itj "actuation a! Letter: Intent.

A tumn am: July a. wt. mm 110. rennin.

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Zions" compensating for t countered by the current in our the surface of the electrode to'the central a. stack having layers of sticks Patented Jan. 23,1911.

will be understood; of course, that the webs or bars in the difierent horizontal layers are connected at the points where they cross the Webs or bars'in the Iayers'above and below so that the entirestructure is;

held together. It will be apparcnt,'-niore over, that the active material should be traversed uniformly by the current. In a order to obtain this' result, in the type of electrode just described, I form the bars or webs of greater cross-section near theccnter of the electrode. This arrangement is clearly.

shown in Figs. 3 and 4, wher' tliebars evidently taper from the center outwardly.

The central portion of the electrode-thus contains more metal in proportion" tance. from the outer surface and I trical resistance of the central :cf the electrode is thus decreased sufiicientlyso that current entering the surface of the-electrode from the electrolytes at any pointv maypass to the top connection fortheelectrodeas readily through the central portion thereof as through the portions nearer the surface; the decreasd. resistance b the central por- 7i w portion thereof. The result is that cu'rrent entering the "electrode from the electrolytes 'for passing from the electrode tit the electro lytes is. distributed uniformly throughout the cross sec'tion of the electrode and the. ace

tive material 'is consequently acted ,inruniformly by the current. Moreover, the geistribntion of metal, and consequentlyg the re? sistance changes uniformly from the sur-i face inwardly, points on a hcrizcntelline parallel to the surface being at. the

potential. This fact also has sin-important effect in producing a stable and uniform.

distribution of current throughouttheen tire cross-section of theelcctrode, Since these is no flow of current in the directions havsurface. given piece of active material is consequently uniform and the difference of potential .between difierent parts of the active material varies uniformly and consequently there is no lo cal. action or discharge between diiferice; ing a horizontal component parallel to the -i The current passing through a ent portions of the active material. It will be obvious moveover, that the: horizontal section of the'e lectrode may be of any con- 11o venient form without aflecting the-appli: 1 cation of my inventionv thereto.

Having thus described my invention, I by the current in the electrode is evenly dis- 10 claim tributed.

An electrode for accumulators comprising In testimony whereof I aflix my signature superimposed layers of webs extending from in presence of two witnesses.

" one side of the electrode to the other, ad; CONSTANTIN DE SEDNEFF jacent Webs having a cell therebetwe'en, and

the Webs of adjacent layers being set at WitnesSes:

angles, the individuaiwebs tapering from LUGIEN Tilmuzmemn the center of the electrode outwardly where- Mxennn Fnnono. 

